White Castle is celebrating their 90th Birthday with a special freebie coupon. Bring the coupon in for a special 90th birthday pin which entitles the wearer to a free slider (with any purchase) on every visit through August 31! The catch? The coupon will only be accepted 90 times per day at each participating location, so you'll want to arrive early to try to get a pin! The coupon is valid through August 31.
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